摘要
在进行岩石类材料疲劳断裂破坏的数值分析时,将损伤力学将裂纹形成与裂纹扩展两个过程有机结合在一起。根据裂纹形成阶段的疲劳曲线(S-N),描述疲劳发展的损伤演变方程,提出了疲劳裂纹扩展的数值计算方法。建立了扩展阶段中裂纹尺寸与载荷循环次数之间的关系,从而将裂纹萌生与扩展这两个独立过程纳入一个统一的理论体系。该方法与断裂力学结合计算出的疲劳寿命与试验值相吻合。
Numerical analysis of fatigue fracture process of rock materials, two phases, fatigue crack initiation and extension, are rightly associated by damage mechanics method. Based on fatigue curve in the crack initiation process, a numerical method to compute the fatigue crack extension, is proposed. The relation between crack length and fatigue life in the crack extension can be obtained by the damage mechanics-finite element method. The above two phases being separately dealt in existing researches are brought into a unified theoretical frame. This method is used to analyze rock-concrete materials, the fatigue lives calculated agree well with the experimental ones.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2008年第3期769-774,共6页
Rock and Soil Mechanics
基金
国家自然科学基金重点资助项目(No.90510017)
国家自然科学基金资助项目(No.10372078,No.50679073)
关键词
岩石
损伤力学
疲劳破坏
裂纹扩展
数值分析
rock
damage mechanics
fatigue fracture
crack extension
numerical analysis
